Steam-engine valve



(No Model.) v

J. R. COOK 8v G. S. HINCHMAN. STEAM ENGINE VALVE.

No. 479,401. Patented July 26, 1892.

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jf ,1f 16' 21% J o mno., wAsHmaruN o c UNITED STATES PATENT OFFICE.

JOHN R. COOK AND CAREY S. I-IINCI-IMAN, OF RUSHVILLE, INDIANA.

STEAM-ENGINE VALVE.-

SPECIFICATION forming part of Letters Patent No. 479,401, dated July 26,1892.

Application filed April 21, 1892.

To au whom it may concern:

Be it known that we, JOHN R. COOK and CAREY S. I-IINOHMAN, of Rushville,Rush county, Indiana, have invented certain new and useful Improvementsin Steam-Engine Valves, of which the following is a specification. i

This invention relates to a peculiar construction and arrangement ofslide-valve and seat-plate designed to permit of the ready reversal ofthe direction of motion of the engine controlled by the Valve.

Our improvements will` be readily understood from the followingdescription, taken in connection with the accompanying drawings, inwhich-- Figure 1 is a vertical longitudinal section through a portion ofthe cylinder and the steam-chest and valve, illustrating our invention,this section being taken in the plane of line a of Fig. 3 and viewed inthe direction indicated by the arrow h, this view showing the valvearranged to give the engine a oertan direction of motion, the passages,&c., shown in solid black being those which are in this case employed;Fig. 2, a similar section showing the valve arrangement' adjusted toproduce the contrary direction of motion, the passages, dac., in activeemployment in the second case being again shown in solid black; and Fig.3, a plan of a portion of the main Valve-seat, portions below the sameappearing in section in the plane of line d of Fig. 1, viewed in thedirection of arrow c. In Figs. 1 and 2 the operating-valve is shown inits position of midstroke, with steam-ports covered.

In the drawings, 1 indicates the cylinder, provided with the usualvalve-seat, which seat has, however, peculiarities to be hereinafterreferred to; 2, the piston; 3, 'the steam-chest, mounted, as usual, onthe valve-seat of the cylinder; 4, the valve-seat of the cylinder, onwhich the steam-chest is located, as usual; 5, the usual steam-portsextending from the valve-seat to the ends of the cylinder; 6, the usualexhaust-port in the valve-seat midway between the two steam-ports; 7 theusual eX- haust-pocket under the valve-seat, into which the exhaust-port6 leads; 8, a pair of addi' tional exhaust-ports in the valve-seat, dis-Serial No. 429,992. (No model.)

posed one outwardly beyond each of the steamports 5 in the seat; 9,additional exhaust-pockets under the valve-seat, one at each end, andinto which the exhaust-ports S lead, the eX- haust-pockets 7 and 9 beingin free communication with each other; 10, communicating passage underthe valve-seat, forming, virtually, a communicating side pipe, placingexhaust-pockets 7 and 9 in free communication with each other; 11, usualsteam-admission to steam-chest; 12, usual exhaust connection from theexhaust-pockets; 13, a seat-plate seating steam-tight upon thevalve-seat and adapted to be moved by hand to extreme positions ofadjustment either to the right or to the left, Fig. 1 showing this plateadjusted to the extreme' right and Fig. 2 showing it adjusted to theextreme left; 14, a stem attached to this plate and projecting out ofthe steamchest through a suitable stuffing-box, this stem serving asmeans by which the plate may be adjusted to its right or left position;15, an exhaust-port through this plate in such position th at when theplate is adj usted to the extreme right, as in Fig. 1, it will coincidewith and form an extension of the exhaust-port 6 in the valve-seat; 16,a pair of steam-ports through the plate in such position as to coincidewith and form extensions of the steamports 5 when the plate is adjustedto the right and in such position, also, as that when the plate isadjusted to the left, as in Fig. 2, the left-hand one of these portswill coincide with and form an extension of the left-hand one of theexhaust-ports 8; 17, a pair of steamports through the plate, one locatedbetween port 15 and the left-hand one of port 16 and the other onelocated to the right beyond the right-hand port 16, these ports being insuch position that when the plate is adjusted to the left, as in Fig.2,they will coincide with and form extensions of the steam-ports 5 ofthe valve-seat; 18, an exhaust-portthrough the plate outwardly beyondthe right-hand one of ports 17, in such position that when the plate isadj usted to the left, as in Fig. 2, it will coincide with and form anextension of the righthand exhaust-port 8 19, a slide-valve arranged forsliding motion upon the seat-plate 13, which plate forms the seat forthis reciprocating slide-valve, which valve will be recipsteam-portsthrough the valve in such posi-y tion that when the seat-plate is adjusted to the right, as in Fig. 1, the reciprocations of the slide-valvewill bring these ports'20 alternately into coincidence with theirrespect-y ive steam-ports 16 inthe seat-plate; 21, an eX- haust-pocketunder the slide-valve between these steam-ports; 22, a pair ofsteam-ports through the slide-valve outwardly beyond the ports 20, insuch position that when the seat-plate is adjusted to the left, as inFig. 2, the' slide-valve in its reciprocations will bring these ports 22alternately into coincidence with their respective steam-ports 17 in theseatfplate; 23, exhaust-pockets under the slide-valve outwardly beyondthe ports 22 and in such position that when the seat-plate is adjustedto the left, as in Fig. 2, the reciprocations of the slide-valve Willplace the ports 17 in the seat-plate alternately in communication withtheir respective exhaust-ports 16 and 18; 24, dotted lines indicatingthe extremes of travel of the slide-valve, and 25 the usual stem of theslide-valve.

Assume the seat-plate to be adjusted permanenlly to the right, as inFig. 1, and the slidevalve toy be given reciprocating motion with astroke indicated by the lines 24. In such case steam goes to thecylinder through ports 2O and 16 and exhausts through ports 16, pocket21, ports 15 and 6, and pocket 7'. The operative ports are shown insolid black, and the white ports are idle ports, as are also the pockets23 and 9. In the case above mentioned it Will be obvious that the enginewill have-a certain direction of motion due to the direction of advanceof thefeccentric, as usual.

It we wish to reverse the direction of moy tion, whether the engine beat rest or running', We adjust the seat-plate to the left-hand position,as in Fig. 2. This f adjustment has caused the abandonment of ports 2015 16 6 and pockets 2l and 7 and has brought into action certain portswhich were idle in the former case.y The cylinder rnow takes steamthrough ports 22 and 17 and exhausts through ports 16 and 17 at the leftand 17 and 18 at the right and through pockets 23 and 9.

We claim as our invention- In a steam-engine valve, the combination,substantially as set forth, of a valve-seat with two steam-ports andwith three exhaustfports, a seat-plate adjustable on said valve-seat andprovided with ports to coincide with the two steam-ports and centralexhaust-port of the valve-seat when the plate is in one position andwith ports to register with the steam-ports when shifted to anotherposition, and a slidevalve working upon said seatplate and' having threeexhaust-pockets and four steamports. y

JOHN R. COOK.

CAREY S. HINCI-IMAN. Witnesses:

GEo. T. MoFFnTT, JOSHIP I-I. KAUFMAN.

`.andtwo outside exhaust-ports of the valve-seat

